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clisp has fewer features and is more stable, making it useful for certain applications

Would you mind expanding on that? What are the "fewer features" that make it more useful than SBCL?

I find SBCL to be highly stable. I haven't used Clisp for many years and I don't think there's been a new release for many years.

Clisp hasn't had a formal release in a long while, but activity on the repo is ongoing.